This is a unit commendation ribbon awarded after Indoctrination.
Awarded to those midshipmen who were members of the Seamanship Platoon for their class’ Indoctrination. The Regimental Evaluations Officer (REO) is authorized to be the recommending official for this award. (USMMA MIDSHIPMAN UNIFORM REGULATIONS, 11 August 2017)
vanguard #4001 nex: seamanship platoon
vanguard #3508 sku 784600 (original)
In 2017 the ribbon was thus:
